Motor boat



April 15, 1930. r MB 1,754,983

MOTOR BOAT Filed May 3, 1927 l @CJCJ a Ivy 6777721: igcwmm, z g

Patented Apr. 15, 1930 PATENT OFFICE ERNESTO (JUMBO, OFI'MILAZZO, ITALY moron BOAT Application filed may 3, 1927, Serial No. 188,587; and in Italy May 4,1926.

The present invention relates to motor boats and has for its object a boat having a motor and a propellerarranged in-the intermediate portion of the hull and carried by a member providing for causing said parts to project into water when in operative conditions and to be retracted within said hull when in inoperative conditions.

the portion of the boat hull intermediate its bow and stern, and therefore the advantage is secured that under no condition the propeller may be caused to operate in air; further the position of the motor and of parts connected therewith acts to lower the centre of gravity Y of the boat and improve its stability.

Further when an internal combustion or explosion engine is used as motor, the cooling of the engine is secured by the fact that it is dipped in water and heat is directly dissipated from said engine in the water body.

The motor and the propeller are mounted in a carrier adapted to be raised in order to retract the motor and propeller within the boat hull when the engine is to be inspected or repaired or when the boat is to be brought on shore, while said carrier may be lowered to carry the motor and propeller in. operative conditions. 0 On the annexed drawing is shown by way of example an embodiment of this invention and- Figure 1 is a side view of a construction of motor boat according to this invention with a portion of the hull removed to show the arrangement of the engine, propeller and carrier;

Figure 2 is an enlarged fragmentary sectional view of the engine and engine carrier;

Figure 3 is a transverse section of the engine and its carrier to a further enlarged scale.

In the construction illustrated, the bottom of the boat hull 1 is provided with an elongated opening 2 in or about the portion of the same intermediate its bow and stern, and on said opening is located a box 3 open at its top and bottom, said box extending upward ly in the boat hull and having its top edge above the boat water line in the conditions of maximum boat load. Said box 3 is fastened with a seal joint on the hull plating by means 1 of bolts 4 and packing 5. The motor and the propeller are located in Of course said box may be made and or fastened in any preferred manner on the boat hull provided it forms a pit in the intermediate portion of the hull said pit being adapt ed to enclose the boat motor or engine and the propeller thereof.

l/Vithin said box or pit is located a motor enclosed in a casing 13 having a bottom portion 14; said casing isarranged for vertical motion in said pit 3 and it is provided with vertical rack bars 6 arranged on its sides and each meshing with a pinion 7 journalled in the adjacent wall of pit 3.

Pinions 7 are located within chambers S) provided inthe walls of pit 3 and the pinions 7 located on the same side of the pit are interconnected by a shaft- 10; the two longitudinal shafts 10 are operated at the same time and in opposite directions by a front transverse shaft 11 having worms meshing with worm wheels each solid with one of said shafts 10; said worms and worm wheels are located in casings 12 and therefore they are not apparent on the drawing.

The transverse shaft 11 may be driven in any suitable manner, say by means of a crank handle not shown. 7

As well understood, by operating the transverse shaft 11 the longitudinal shafts 10 and pinions 7 are actuated and in turn the rack bars 6 with casing 13 connected therewith are moved vertically in the pit 3.

Longitudinal bars 20 may be arranged along the edges of the opening 2 and bottom mouth of pit 3 to support the casing 13 and the motor when said casing is lowered as shown in Figure 3.

- gine, a large ,i i c The engine is located in the casing'13 which encloses a portion of the engine and has its.

bottom provided by extensions 14 of the engine body. Said casing has a top rib or downwardly extending edge 16 adapted to seat in a groove 17 of thectop mouth 0 pit 3 adapted to carry packing means.

-A cover 19 is located on casing 13 to close its top mouth.

Of course a motor of any kind may be used, as an electric-motor or an internal combustion or explosion engine, and no detailed description of the same is required;

As shown on the drawing when the motor is an internal combustion or explosion enortion 21 of the same is arranged to pro ect downwardly from casing 13 and pit 3 to cause it to dip inoutstanding water body. Thus an efiicient cooling action is obtained without needing means for a water circulation.

In the drawing the casing 13 and the engine are shown in operative position in which the en ine projects downwardly from the boat hu with the propeller 18 under thebotto'm line of the hull.

When the engine and propeller must be raised the shaft 11 is operated to actuate shafts 10 and pinions 7 and to retract the engine and propeller within pit 3 and boat hull.

The propeller 18 is carried by a shaft not apparent on the drawing which is enclosed within and journalled in the engine casing, and said propeller may be arranged at the aft end of said casing as illustrated or it may be arran ed at the bow end ofthe same, the pit 3-hav1ng an elongated sha e to provide a sufficient space 2 for passage 0 the engine and propeller. I l In the described construction the motor or engine and the propeller provide a unitary member which is mounted in the boat hull in a manner providing for putting the propeller in and out of operation and no line shaft is to be arranged in the-boat hull intermediate the motor and the propeller as in usual construe: tions. i Of course a plurality of motors may be provided in a single pit of the described charactor and saidmotors may have their shafts ali ed with or parallel to each other and eac of them may actuate a separate propeller or they may, drive common propellers.

The propellers may be solid with the motor shaft for a direct drive, or they may be driven through a reducing gear. i

Of course the present invention is not reof the boat.

combination of a well in said central ortion of said hull opening in the water un er it, a casing having abottom and located in said Well, a motor unit and a propeller mounted in said casing bottom, a lower portion of said motor unit and said propeller depending under the said casing bottom and the upper por- I tiQn of said motor unit being enclosed within said casing, andcooperating means in said well andin said casing to support said casing with said bottom at the lower mouth of said well for the normal operation of the boat and to lift said casing into said well.

2. In a-- motor boat 'having propelling means in the central portion of its hull, the combination of a well in the central portion of said hull opening in the water under it, a casing having a bottom and located in said well and adapted to close the lower mouth of said well, a motor unit and a propeller mounted in said casing bottom, a lower portion of said motor unit and said propeller depending under said casing bottom and the upper portion of said motor unit being enclosed within said casing, cooperatin means in said well and in said casing, to lift and lower said casing in said well and means in the lower bottom for the normal operation of the boat. 3. In a motor boat having propellingmeans in the central portion of its hull, the'combinacasing with its. bottom at the lower mouth of said well for the normal operation of the boat and to lift said casing into said well.

4. In a motor boat having propelling means in the central portion of its hull, the combination of a well in the central portion of said "mouth of said well for supporting said casing hull opening in the water under it, a casing v having a bottom and located in said well and adapted to close the lower mouth of said well,

an internal combustion engine mounted in' said casing bottom with'part of its cylinders enclosed within said casing and its shaft case under said casing bottom, a propeller carried by the shaft of said engine, cooperating means in said well and in saidcasing to llft and lower said, casing in said well and means in the lower mouth of said well for supporting said casing 5. In a motor boat havin propelling of said hull opening in the water under it, a

bottom for the normal operation 7 casing having a bottom and located in said well, an internal combustion engine having a plurality of c linders in line in the direction of the axis said hull and mounted in said bottom with part of its cylinders enclosed within said casing, said engine eomfrising a shaft case of elongated form, locate under said casing bottom, a propeller carried by the shaft of said engine, and cooperating means in said well and in said casing to support said casing with its bottom at the lower month of said well for the normal operation of lthe boat and to lift said easing into said we 1.

In testimony whereof I have signed my name to this specification.

w ERNESTOCUMBO." 

